Prepare Jasmine's Pretty Printer for working with Backbone. Jasmine has serious problems for printing Backbone objects linked with other objects/Collections (e.g when an expectation fails). It enters in long loops leaving the browser totally frozen.

gistfile1.js

var addBackboneSupportToJasminePrettyPrinter = function() {
    var oldPrettyPrinterFormat = jasmine.PrettyPrinter.prototype.format;
    jasmine.PrettyPrinter.prototype.format = function(value) {
        var self = this;
        if(value instanceof Backbone.Model){
            this.emitObject(value.attributes);
        }
        else if(value instanceof Backbone.Collection){
            value.each(function(model) {
                self.emitScalar(model.cid);
            });
        }
        else{
            oldPrettyPrinterFormat.apply(this, arguments);
        }
    };
};

Thanks! This is perfect.